Pin urllib3<2.0.0 to fix eleuther eval errors

[RdoubleA]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (please add here)

Please link to any issues this PR addresses.

Changelog

What are the changes made in this PR?

• Pin urllib3 version to avoid transient errors from Latest release of requests causes urllib3 to throw an error psf/requests#6443 in our CI

Test plan

Reinstalled dev install, verified urllib3 version

Successfully installed torchtune-0.0.0 urllib3-1.26.20

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1738

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✅ No Failures

As of commit f32819c with merge base 29888d1 ():
💚 Looks good so far! There are no failures yet. 💚

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.72%. Comparing base (10b02e0) to head (f32819c).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1738      +/-   ##
==========================================
- Coverage   25.99%   25.72%   -0.27%     
==========================================
  Files         304      305       +1     
  Lines       15627    15856     +229     
==========================================
+ Hits         4062     4079      +17     
- Misses      11565    11777     +212     

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